/*
 * $Id: JSONArray.java,v 1.1 2006/04/15 14:10:48 platform Exp $
 * Created on 2006-4-10
 */
package org.json.simple;

import java.io.IOException;
import java.io.Writer;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;

/**
 * A JSON array. JSONObject supports java.util.List interface.
 * 
 * @author FangYidong<fangyidong@yahoo.com.cn>
 */
public class JSONArray extends ArrayList implements List, JSONAware, JSONStreamAware {

    private static final long serialVersionUID = 3957988303675231981L;

    /**
     * Encode a list into JSON text and write it to out. 
     * If this list is also a JSONStreamAware or a JSONAware, JSONStreamAware and JSONAware specific behaviours will be ignored at this top level.
     * 
     * @see org.json.simple.JSONValue#writeJSONString(Object, Writer)
     * 
     * @param list
     * @param out
     */
    public static void writeJSONString(List list, Writer out) throws IOException {
        if (list == null) {
            out.write("null");
            return;
        }

        boolean first = true;
        Iterator iter = list.iterator();

        out.write('[');
        while (iter.hasNext()) {
            if (first) {
                first = false;
            } else {
                out.write(',');
            }

            Object value = iter.next();
            if (value == null) {
                out.write("null");
                continue;
            }

            JSONValue.writeJSONString(value, out);
        }
        out.write(']');
    }

    public void writeJSONString(Writer out) throws IOException {
        writeJSONString(this, out);
    }

    /**
     * Convert a list to JSON text. The result is a JSON array.
     * If this list is also a JSONAware, JSONAware specific behaviours will be omitted at this top level.
     *
     * @see org.json.simple.JSONValue#toJSONString(Object)
     *
     * @param list
     * @return JSON text, or "null" if list is null.
     */
    public static String toJSONString(List list) {
        if (list == null) {
            return "null";
        }

        boolean first = true;
        StringBuffer sb = new StringBuffer();
        Iterator iter = list.iterator();

        sb.append("\n");
//        JSONObject.inline++;
        sb.append(JSONObject.tab());
        sb.append('[');
        sb.append("\n");
        JSONObject.inline++;
        while (iter.hasNext()) {
            if (first) {
                first = false;
            } else {
                sb.append(",\n");
            }
            sb.append(JSONObject.tab());
            Object value = iter.next();
            if (value == null) {
                sb.append("null");
                continue;
            }
            sb.append(JSONValue.toJSONString(value));
        }
        sb.append("\n");
        JSONObject.inline--;
        sb.append(JSONObject.tab());
        sb.append("]");
        return sb.toString();
    }

    public String toJSONString() {
        return toJSONString(this);
    }

    public String toString() {
        return toJSONString();
    }
}
